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blogJune 30th 2021 • 6 m read

Case Study: Turnaround Time Reduction Through Real Time Alerts

Assaia was the only source for high quality data concerning apron / airside operations

The airport for which we are presenting results in this case study is a medium sized, single runway airport which handled about 100,000 flights and 3 million passengers in 2019. The airport has 19 contact stands as well as remote handling facilities. It is well connected and handles a lot of traffic related to the offshore oil & gas industry.


The airport has a long history of innovation and continuous improvement. In order to maximise capacity, improve on-time-performance (OTP), enhance safety and improve passenger experience, the airport is working on a digital twin project. In May of 2020, the airport approached Assaia as it became apparent that Assaia was the only source for high quality data concerning apron / airside operations, providing the real-time gate operations data a digital twin requires to operate.


The Setup


From July through September 2020, Assaia worked closely with both the airport as well as a third-party supplier of a digital twin platform to implement the ApronAI system. The existing camera infrastructure (one camera per stand) was used, which resulted in a fast and cost-efficient implementation.


dashboard.png Figure 1: Assaia Turnaround Control application with real-time alerts



The ApronAI software was deployed on an on-premise server. An integration with the airport’s Airport Operational Database (AODB) was established and Assaia’s API was connected to the digital twin platform. Furthermore, Assaia’s Turnaround Control Application was configured for several predefined use cases (also see next section).


Real Time Turnaround Alerts


During the implementation project, Assaia and the airport worked closely together to define the intended use of the ApronAI system. This kind of close collaboration is key to ensure that the software is properly configured. Even more importantly, the project partners took the time to prepare the organization and users for the change in their way of working once the tool was released.


One of the key use cases for the airport was to receive real-time alerts for situations in which specific ground handling activities did not start on time. The specific business rules for each turnaround activity were jointly defined and configured into the system. For example, the system will send an alert if the cleaning team has not been detected on the aircraft stand within 3 minutes after passenger offboarding has ended.


Real time awareness about deviations from the desired situations allows operational staff to act directly and minimise the impact on on-time performance


In the case of this airport, alerts are sent to the AOC operative who then calls the respective ground handler service provider. The goal is not to single out individuals’ performance but rather mitigate the negative OTP effects of a disruption.


The Results


In order to evaluate the benefits of the ApronAI system, we looked at turnaround durations between the end of October 2020 to early April 2021. This period obviously coincided with the COVID crisis. As we have often observed aircraft being parked on the stands where the ApronAI was active, we have removed all turnarounds that lasted less than 15 minutes and/or more than 2.5 hours (as these were typically parked aircraft and did not resemble active turnarounds). From the plot below we can see that the turnaround duration decreased from an average of about 40 minutes to 35 minutes.


This is a decrease in turn duration of more than 12%!


We also checked that this decrease in turnaround duration was not caused by some COVID-related circumstance. For example we checked whether the turn duration was not a result of a decrease in passenger numbers during the same period. Our analysis shows that there is only a moderate correlation between passenger numbers and turnaround duration (correlation coefficient of 0,51). However, there was no significant reduction in passenger numbers over the analysis period.


This means that it is unlikely that the reduction in turnaround times have been caused by passenger numbers. We did see however that the mix of aircraft types changed slightly over the reporting period and that some aircraft types with a shorter average turnaround duration became more frequent over time. However, even when excluding this specific aircraft type, the reduction in turnaround duration was still 11,6%.


turnaround time reduction through real time alerts .png Graph 1: Turnaround duration decreases over time significantly



To ensure that the results were not generic across the entire airport, we also investigated the turnaround times for the stands where the ApronAI system was not active. We found that on these stands there was no reduction in turnaround times which means that the reduction was unique for the stands where the system was active.


The Business Case


Even though most people agree that shorter turnaround times are better, let us also look at how this achievement can be used to calculate a business case. First we will look at airline benefits and then evaluate the value for airports.


Airlines


Winning 5 minutes per turnaround over a day therefore might enable some additional flights

For airlines, time is money. As long as the aircraft is flying it is performing a money-generating task. While it is on the ground it is not. We believe there are 2 different approaches to take when evaluating shorter turnaround times for airlines. First, the time gained can be used to compensate for delay minutes. This rather simplistic approach uses the value of a delay minute, which is typically regarded to be around $100 per minute*. This would imply a benefit of $500 per flight (assuming that each flight has 5 minutes of delay that can be compensated).


A second approach, in case there are no delay minutes to compensate, is to look at aircraft utilization rates. The 5 minutes gained on a single turn do not result in 5 minutes additional flight time. Even winning 5 minutes on all turnarounds at one station does not necessarily result in being able to add additional flights. However, some aircraft might not fly another leg on any given day because of some time shortage.


Winning 5 minutes per turnaround over a day therefore might enable some additional flights. If these gains are realized across the network, flight plans can be optimized to reap the benefits of network-wide shorter turnaround times. The exact value of additional flights is very different per airline but it at least adds revenues for all those additional flights. Furthermore, the cost of those additional flights is marginally lower as all the airline’s fixed costs are spread over more flights.


Airport


...saving 5 minutes per turn, allows the same flight schedule to be facilitated with 3 less stands...

For the airport the main benefit of shorter turnaround times is shorter stand occupancy which can lead to higher stand utilization rates. The same logic applies as in the case of the aircraft utilization rates: not every minute reduction in stand occupancy can be used; however, the gains throughout the day over the entire airport can be used by gate planning optimization.


In a gate optimization exercise we did for a large European hub airport, we found that saving 5 minutes per turn, allows the same flight schedule to be facilitated with 3 less stands during the morning peak hours. This means that the airport has basically gained 3 additional, and highly valuable, aircraft stands. The value of this result can be calculated as the opportunity cost of building 3 additional stands. Alternatively, we can also evaluate the additional revenue these stands will generate for the airport.


Let’s conservatively assume that each of the 3 stands will accommodate 1 flight per day during the airport’s peak hour. This means 3 additional flights per day or 1,095 additional flights per year. Average aeronautical and commercial revenue (averaged between narrowbody and widebody flights) from a flight is around $10,000 (based on our internal calculations using public aviation charges and spend per pax information).


Thus, we can conclude that reducing the turnaround time with 5 minutes generates the airport in our example $11 million per year.


If you are eager to learn more about this particular case study or about different ways in which Assaia’s ApronAI software can create value for your airport or airline contact us at info@assaia.com or via the website form.